Abstract

We describe the case of a 55 year old female who presented with a mass in her right
breast. Mammography confirmed a 2 × 2 cm lump, suspicious of malignancy. The lesion
was widely resected. Histological examination revealed this to be a benign granular
cell tumour.

Granular cell tumour is a rare tumour that very occasionally presents within the breast.
It is possibly of Schwann cell origin. Clinical features and subsequent investigations
may be suggestive of breast malignancy. Tumour cells showing positive immunostaining
for S-100 and PAS is in keeping with the diagnosis. Wide local resection is the gold
standard treatment.